class AddFieldsToComments < ActiveRecord::Migration
  def self.up
		add_column :comments, :root_id, :integer
		add_column :comments, :lft, :integer, :default=>0
		add_column :comments, :rgt, :integer, :default=>0
		add_column :comments, :depth, :integer, :default=>0
  end

  def self.down
		remove_column :comments, :root_id
		remove_column :comments, :lft
		remove_column :comments, :rgt
		remove_column :comments, :depth
  end
end
